Stone-saw.



PATENTED NOV. 14, 1905.

C. L. MIEL. STONE SAW.

APPLIOATION FILED APR. 24. y1905.

UNITED STATES PATENT OFFICE.

CHARLES L. MIEL, OF SACRAMENTO, CALIFORNIA, ASSIGNOR TO THE UNITEDSTATES STONE SAW COMPANY, OF TUCSON, ARIZONA TER- RITORY, A CORPORATIONOF ARIZONA TERRITORY.

STO N E-SAW.

Specification of Letters Patent.

` Patented Nov. 14, 1905.

Application led April 24, 1905. Serial No. 257,260.

To all whom it may concern:

Beit known that I, CHARLES L. MIEL, a citi- Zen of the United States,residing at Sacramento, Sacramento county, California, have inventedcertain new and useful Improvements in Stone-Saws, of which thefollowing is a full, clear, and exact description.

My invention relates to improvements in stone-saws, and particularly tothe end blades. These saws comprise a series of vertical blades carriedby a longitudinally-movable beam and adapted to coact with looseabrasive material for effectingthe cut in-the rock.

It is my object to improve the end plates so as to effect a bettercutting operation, but without permitting the end blades to entirelyleave the rockin the eXtreme positions. This prevents buckling orwabbling of the blade, and consequent possibility of injury to theblades as well as to -the stone which is being out.

The invention consists in the employment of unusually broad end bladeshaving a portion of the lower edge cut away so as to form two relativelyshorter bearing-surfaces, which improves the abrasive action withoutmaterially affecting the strength of the blade.

In the drawings, Figure l is a side elevation of a stone-saw with bladesembodying the improvements of my invention, a portion only of the twoends of the saw being shown. Fig. 2 is a view,.on a larger scale, ofasingle blade embodying the improvements of my invention.

l represents the rock which it is desired to cut. Suitable abrasivematerial is applied along the line of work and then pressure applied bymeans of a saw.

2 is the saw-beam, provided with any suitable means for-producinglongitudinal movement and any suitablerneans of support for raising thesame.

3 3 are the end blades carried by the sawbeam. 4 4 are intermediateblades. The intermediate blades may be provided in any suitable number,depending upon the desired length of the saw for the operation at hand.

The blades are all formed of suitable steel of suicient strength and ofsuch dimension as is necessary. e

The end blades are much wider than the intermediate blades and soproportioned relative to the longitudinal stroke of the saw that theblades never entirely leave the body of the stone when the cut is oncestarted. Therefore there is no danger of the end blades being displacedon the return movement.

In the lower edge of the end plate I cut a notch 5, preferably havingone edge vertical and the other inclined toward the outer edge of theplate, thus dividing the bearing-surface of the blade into two portions6 and 7. The effect, therefore, of narrow blades and the consequent morefrequent stirring up of the abrasive material is produced. The cut 5 is,however, not of sufficient size to materially affect the strength of theblade, so that I substantially preserve the advantages of a very broadend blade.

While I do not intend to have it inferred that my invention is limitedto such dimensions, I will give suitable proportions for a plate aswidth thirty inches, having a notch with bearing edge 6 of ten inches,edge 7 of twelve inches, and vertical depth of the notch 5 of twelveinches.

What I claim isl. In a stone-saw, a beam, a series of independentvertically-disposed saw-blades carried thereby and spaced apart fromeach other, the end blades being broader than the inter mediate bladesand having notches in their bearing edges dividing the bearing edgesinto a plurality of surfaces, for the purpose speciiie 2. In astone-saw, a broad vertically-arranged plate-lilre blade and having anotch in its lower edge leaving two straight bearing edges, one of theWalls of the notch being substantially vertical and the other wallinclined.

CHARLES L. MIEL.

Witnesses:

L. VREELAND, R. C. MITCHELL.

